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Unaudited Condensed Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenue $ 12,251 $ 10,775 $ 35,610 $ 29,307
Operating expenses:        
Costs of revenue 5,487 4,341 15,649 12,224
Selling, general and administrative expenses 11,528 9,202 32,739 27,104
Research and development expenses 1,740 1,018 5,035 2,403
Total operating expenses 18,755 14,561 53,423 41,731
Loss from operations (6,504) (3,786) (17,813) (12,424)
Interest expense (678) (647) (1,986) (1,913)
Other income, net 3 125 1 985
Loss before income taxes (7,179) (4,308) (19,798) (13,352)
Income tax benefit 0 0 0 118
Net loss $ (7,179) $ (4,308) $ (19,798) $ (13,234)
Net loss per share, basic (in dollars per share) $ (0.42) $ (0.34) $ (1.27) $ (1.05)
Net loss per share, diluted (in dollars per share) $ (0.42) $ (0.34) $ (1.27) $ (1.05)
Weighted-average number of shares used to compute net loss per share, basic (in shares) 16,945,591 12,644,348 15,636,150 12,626,259
Weighted-average number of shares used to compute net loss per share, diluted (in shares) 16,945,591 12,644,348 15,636,150 12,626,259